CN114867379A - Footwear member and footwear - Google Patents

Footwear member and footwear Download PDF

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Publication number
CN114867379A
CN114867379A CN201980103255.1A CN201980103255A CN114867379A CN 114867379 A CN114867379 A CN 114867379A CN 201980103255 A CN201980103255 A CN 201980103255A CN 114867379 A CN114867379 A CN 114867379A
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China
Prior art keywords
tan
shoe
footwear
styrene
thermoplastic elastomer
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Chinese (zh)
Inventor
大崎隆
田边竜朗
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Asics Corp
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Asics Corp
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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/04—Plastics, rubber or vulcanised fibre
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C08L101/12—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2410/00—Soles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

A shoe member comprising a material containing a thermoplastic elastomer, wherein the material has a glass transition temperature (Tg) of 10 ℃ or less, a tan delta that is a loss tangent in a dynamic viscoelasticity test of 0.4 or more, and a delta tan delta that is a change amount of tan delta when a strain is changed from 5% to 100% is 0.15 or more.

Description

Footwear member and footwear
Technical Field
The present invention relates to a shoe member and a shoe.
Background
For example, in footwear members such as outsoles for shoes used in rock climbing or mountain climbing, weight reduction, and improvement in both static friction performance and dynamic friction performance are desired.
In conventional shoe members (such as shoe soles) mainly composed of rubber, it is generally necessary to blend a filler (SiO) in order to obtain necessary mechanical properties (tensile strength, abrasion resistance, etc.) 2 Etc.). However, when a filler is added to a material for a shoe member, there is a problem that the specific gravity of the material becomes heavy.
In addition, in the shoe member mainly composed of rubber, the static friction coefficient of the shoe member becomes large depending on the amount of the filler in the raw material and the dispersion state thereof. The reason for this is that: the amount of the filler blended increases to form an aggregate structure of the filler itself, so that the hysteresis loss (Δ tan δ) due to the deformation of the material increases, and the static friction performance (coefficient of static friction: μ s) on the rough surface is improved. However, when the amount of the filler blended increases and the dynamic friction coefficient increases to some extent, the increase rate of the dynamic friction coefficient with respect to the amount of the filler blended tends to decrease (see the dashed line portion in fig. 1). Therefore, there is a limit to a method of increasing the amount of the filler to be blended in the rubber-based shoe member, from the viewpoint of further improving the static friction performance and the dynamic friction performance.
Disclosure of Invention
Problems to be solved by the invention
In view of the above problems, an object of the present invention is to provide a lightweight shoe member using a thermoplastic elastomer and having high static and dynamic friction coefficients.
Means for solving the problems
A footwear component comprising a material comprising a thermoplastic elastomer, and wherein,
with regard to the material in question,
a glass transition temperature (Tg) of 10 ℃ or lower,
tan delta being a loss tangent in a dynamic viscoelasticity test is 0.4 or more, and
when the strain is changed from 5% to 100%, the change in tan δ, namely, Δ tan δ, is 0.15 or more.
ADVANTAGEOUS EFFECTS OF INVENTION
In the present invention, by using a material selected so that Tg, tan δ and Δ tan δ fall within a predetermined range, it is possible to provide a shoe member using a thermoplastic elastomer, which is lightweight and has a high static and dynamic friction coefficient.
Drawings
FIG. 1 is a schematic graph for explaining the relationship between the static friction coefficient and the dynamic friction coefficient between a conventional footwear member and the footwear member according to the embodiment.
FIG. 2 is a graph showing the relationship between tan. delta. and the temperature of the materials of examples 1 and 2 and comparative examples 1 and 2.
FIG. 3 is a graph showing the relationship between shear strain and tan. delta. with respect to the material of comparative example 2.
FIG. 4 is a graph showing the relationship between the shear strain and tan. delta. for the materials of examples 1 and 2 and comparative example 2.
FIG. 5 is a schematic diagram for explaining the definition of the static friction coefficient and the dynamic friction coefficient.
FIG. 6 is a schematic diagram for explaining a method of measuring the static friction coefficient and the dynamic friction coefficient.
FIG. 7 is a perspective view showing a shoe including a footwear member according to an embodiment.
FIG. 8 is a side view of the sole of the shoe shown in FIG. 7, as viewed from the outer foot side.
FIG. 9 is a schematic diagram for explaining a method of measuring dynamic viscoelasticity.
FIG. 10 is a schematic diagram for explaining the range of Tg.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments described below, the same or common portions are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.
< parts for shoes >
The footwear member of the present embodiment includes a material containing a thermoplastic elastomer.
(Material)
As for the material used in the present embodiment,
the Tg, which is the glass transition temperature, is 10 ℃ or less, preferably-60 ℃ to 5 ℃, and more preferably-50 ℃ to-30 ℃ (see FIG. 10 (a)). When a plurality of polymers having different tgs are blended, two or more tgs (peak of tan δ) may be present. In this case, the Tg (maximum peak of tan. delta.) of at least the polymer that becomes the base material (for example, a polymer that occupies 50 mass% or more of the material) is preferably 10 ℃ or less, more preferably-60 ℃ to 5 ℃, and still more preferably-50 ℃ to 30 ℃ (see FIGS. 10(b) and (c)).
The loss tangent in the dynamic viscoelasticity test, i.e., tan delta, is 0.4 or more, preferably 0.5 to 0.7.
When the strain is changed from 5% to 100%, the change amount of tan delta, namely, delta tan delta, is 0.15 or more, preferably 0.2 to 0.4.
Referring to fig. 1, in a conventional rubber-based shoe member, the static friction coefficient of the shoe member increases according to the amount of filler blended in the raw material, but when the amount of filler blended increases and the dynamic friction coefficient increases to some extent, the increase rate of the dynamic friction coefficient with respect to the amount of filler blended tends to decrease (see the dotted line portion in fig. 1). In contrast, in the footwear member of the present embodiment having the predetermined characteristics (Tg, tan δ, and Δ tan δ), both static friction performance and dynamic friction performance can be improved without using a filler (see the solid line portion in fig. 1).
Further, the footwear member of the present embodiment aims to provide a composite elastic modulus (E) * ) The material is a material with a static friction coefficient of more than 1.8 and a pressure of less than 50 MPa.
The present inventors have also found that the relation between tan δ and the static friction coefficient differs between conventional shoe components comprising a rubber containing a filler as a main component and a thermoplastic elastomer (without a filler). From this, the following possibilities can be predicted: in the case of a thermoplastic elastomer, a high static friction coefficient and a high dynamic friction coefficient can be achieved in comparison with a rubber in which a filler is blended.
(thermoplastic elastomer)
The thermoplastic elastomer used in the present embodiment is not particularly limited, and examples thereof include: styrene-based thermoplastic elastomers (styrene-based elastomers), Thermoplastic Polyurethanes (TPU), olefin-based polymers, ethylene-vinyl acrylate copolymers, ethylene-vinyl acetate copolymers, and the like. The thermoplastic elastomer preferably comprises a styrenic thermoplastic elastomer or TPU. In this case, it is desired to easily obtain a material satisfying the Tg, tan δ, and Δ tan δ.
Examples of the styrene-based thermoplastic elastomer include: styrene-ethylene-propylene-styrene copolymer (SEPS), styrene-ethylene-ethylene-propylene-styrene copolymer (styrene-ethylene-propylene-styrene copolymer, SEEPS), styrene-ethylene-ethylene-propylene-styrene copolymer (styrene-ethylene-propylene-styrene copolymer, SEBS), styrene-isoprene-styrene copolymer (styrene-isoprene-styrene copolymer, SIS), styrene-butadiene-styrene copolymer (styrene-butadiene-styrene copolymer, SBS), styrene-ethylene-butylene copolymer (styrene-ethylene-butylene copolymer, SEB), styrene-ethylene-styrene copolymer (styrene-isobutylene-styrene copolymer, SEB), styrene-isobutylene-styrene copolymer (styrene-isobutylene-styrene copolymer, SIBS), styrene-butadiene-styrene-butadiene copolymer (SBSB), styrene-butadiene-styrene-butadiene-styrene copolymer (SBSBs), and the like. The styrene-based thermoplastic elastomer is preferably one of styrene-based elastomers, for example, at least one of SEPS, SEEPS, and SEBS.
Examples of the TPU include "ET 870SH11 UNJ" (manufactured by BASF) and "ET 1570A" (manufactured by BASF).
The material for the footwear member may contain a filler, a resin or rubber other than the thermoplastic elastomer, a plasticizer, a reinforcing agent, a viscous liquid, a crosslinking agent, and the like within a range in which the effects of the present invention are exhibited.
Complex elastic mold for material of shoe componentAmount (E) * ) Preferably 4MPa to 70MPa, more preferably 10MPa to 50 MPa. The reason for this is that: it is desirable to have such a hardness in order to exert performance in use.
The material preferably comprises a viscous liquid. In this case, Δ tan δ of the material can be increased.
Examples of the viscous liquid include liquid rubber, high molecular weight oil, and the like. As the liquid rubber, for example, Liquid Styrene Butadiene Rubber (LSBR) can be cited.
The blending ratio of the viscous liquid (liquid rubber or the like) to the total amount of the material is preferably 1 to 30% by mass, and more preferably 5 to 25% by mass.
Preferably, the material comprises a cross-linking agent. In the case of materials comprising viscous liquids, exudation by the viscous liquid can be prevented by the crosslinking agent.
The blending ratio of the crosslinking agent to the total amount of the material is preferably 0.05 to 1% by mass, and more preferably 0.1 to 0.5% by mass.
Examples of the crosslinking agent include dicumyl peroxide (DCP) and di- (tert-butylperoxyisopropyl) benzene (BIPB).
The footwear component (material) is preferably transparent or translucent. This makes it possible to use the light source embedded in the sole of a shoe for emitting light, or to improve the design (design) of the shoe.
The material preferably contains no filler, or the content of the filler is 10 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer. In this case, the specific gravity of the material can be set to 1.0 or less, and the transparency of the material can be easily maintained.
From the viewpoint of weight reduction of the footwear member, the specific gravity of the material of the footwear member is preferably 1.0 or less. For example, in the case of rock climbing shoes, the amount of shoe members used for soles is large, and this greatly affects the weight of the shoes, and therefore, it is expected that the efficiency is particularly improved by the weight reduction of the shoe members. In addition, even in the case of running shoes, it is expected that the efficiency will be improved by reducing the weight of the footwear member.
(method of manufacturing footwear Member, etc.)
It is known that friction is represented by two parameters. Two parameters are the sticking term and the lag term. The adhesion term includes the contact area and the surface free energy. Basically, the friction force can be increased by softening the hardness of the material and enlarging the contact area. Further, the closer the surface energy of the material is to the surface free energy of the material of the object in contact with, the greater the frictional force between the material and the object.
The hysteresis term (tan δ) is adjusted by a balance between the type and amount of polymer, the type and amount of filler, the amount and state of addition (dispersion state, aggregation structure, etc. of filler), the type and amount of plasticizer, and the like. When the tan δ of the elastic body is high, energy consumption accompanying deformation is large at the time of deformation, and the frictional force also becomes large.
When walking or traveling on a fine uneven asphalt or rock ground, the contact area of the shoes is relatively small. In this case, a material design in which the hysteresis term is taken into consideration in order to increase the frictional force is particularly important. In addition, in the case of a rough and wet road surface, the contribution of this term is more significant.
Since the additive property is established in the viscoelasticity of the polymer, the properties (Tg, tan δ, and the like) relating to the viscoelasticity of the blend material can be roughly predicted from the sum of the properties of the respective resin materials weighted by the weight ratio.
Further, since LSBR is a low molecular component having a styrene side chain, Δ tan δ is increased by blending LSBR to a polymer material.
< shoes >
The invention also relates to a shoe comprising said footwear component.
First, an example of a general structure of the shoe according to the present embodiment will be described with reference to fig. 7 and 8.
As shown in fig. 7, the shoe 1 includes an upper 10 and a sole (sole) 20. The upper 10 has an overall shape that covers the portion of the inserted instep side. The sole 20 is located below the upper 10 in a manner that covers the ball of the foot.
The insole may be housed inside the upper 10 so as to cover the inner bottom surface of the upper 10.
The upper 10 includes: a shoe upper body 11, a tongue (shoe tongue)12, a toe side reinforcing portion 13, a heel side reinforcing portion 14, an eyelet (eyelet) reinforcing portion 15, and a lace (shoe lace) 16. The tongue 12, the toe-side reinforcing portion 13, the heel-side reinforcing portion 14, the eyelet reinforcing portion 15, and the shoelace 16 are fixed or attached to the upper body 11.
A lower opening portion covered with the sole 20 is provided at a lower portion of the upper body 11, and a bottom portion (insole) is formed by sewing a lower end of the upper body 11 by a pocket, as another example. Here, in the case where the bottom portion is provided at the lower portion of the upper body 11, the entire upper body 11 may be formed in a bag shape in advance by sock knitting, circular knitting, or the like, in addition to the aforementioned bag seam. An upper opening portion that exposes an upper portion of the ankle and a part of the instep is provided in the upper portion of the upper body 11. The tongue 12 is fixed to the upper body 11 by sewing, welding, or adhesion, or a combination thereof, so as to cover a portion of the instep provided at the upper opening of the upper body 11. As the upper body 11 and the tongue 12, for example, woven fabric, knitted fabric, synthetic leather, resin, or the like is used, and particularly, in shoes requiring air permeability or lightweight property, a double raschel warp knitted fabric in which polyester yarn is woven is used.
The toe side reinforcing portion 13 and the heel side reinforcing portion 14 are provided to reinforce a portion that particularly requires durability, that is, a portion covering the toe of the foot and a portion covering the heel of the foot of the upper body 11, respectively, and are present so as to cover the outer surface of the upper body 11 at these portions.
The eyelet reinforcing portion 15 is provided to reinforce the periphery of an upper opening portion (i.e., a portion to which the shoelace 16 is attached), which is a portion where durability is particularly required, provided in the upper body 11 and exposing a part of the instep, similarly to the toe side reinforcing portion 13 and the heel side reinforcing portion 14, and is present so as to cover the outer surface of the upper body 11 of these portions.
The toe side reinforcing portion 13, the heel side reinforcing portion 14, and the eyelet reinforcing portion 15 are made of, for example, woven fabric, knitted fabric, synthetic leather, resin, or the like, which is fixed to the outer surface of the upper body 11 by sewing, welding, bonding, or a combination thereof. These toe-side reinforcing portion 13, heel-side reinforcing portion 14, and eyelet reinforcing portion 15 are not essential structures, and some or all of them may be omitted.
The shoelace 16 includes a string-shaped member for closing the periphery of the upper opening, which is provided in the upper body 11 and exposes a portion of the instep, in the foot width direction, and is inserted into the plurality of holes provided in the periphery of the upper opening. In a state where a foot is inserted into the upper body 11, the shoelace 16 is tightened, thereby allowing the upper body 11 to be closely attached to the foot. The shoelace 16 is not necessarily configured, and may be configured such that the upper body is closely attached to the foot by means of a hook and loop fastener, or may be configured such that the upper body 11 is closely attached to the foot by merely inserting the foot into the upper body 11 by forming the upper body 11 in the shape of a sock not including a tongue.
The sole 20 (outsole) has a substantially flat shape as a whole. The shoe sole 20 has a ground contact surface 20b (see fig. 8) on its lower surface. In fig. 7, the sole 20 is integrated with the heel-side reinforcing portion 14, but may be formed separately.
An insole, not shown, is attached to the upper body 11 so as to cover the lower opening of the upper body 11. More specifically, the insole is fixed to the lower edge of the upper body 11 by sewing. The insole is fixed to the upper surface of the sole 20 by bonding, welding, or the like. The insole includes, for example, a woven fabric, a knitted fabric, or a nonwoven fabric containing synthetic resin fibers such as polyester, or a resin foam containing a resin material as a main component and a foaming agent or a crosslinking agent as an accessory component. Further, as described above, the insole may be a member constituting a part of the sole 20, but is not necessarily a structure and may not necessarily be provided.
As described above, the shoe insole, not shown, is housed inside the upper 10, and is detachably attached to the inner bottom surface of the upper 10, or is fixed to the inner bottom surface of the upper 10 by welding, bonding, or the like. The insole is made of, for example, a woven fabric, a knitted fabric, or a nonwoven fabric containing synthetic resin fibers such as polyester, or a resin foam containing a resin material as a main component and a foaming agent or a crosslinking agent as a sub-component, and is disposed so as to make good contact with the foot. In addition, the insole is not necessarily required and may not be provided.
As shown in fig. 8, the shoe sole 20 has an upper surface 20a and a ground contact surface 20b as a lower surface.
The sole 20 has, for example, a shape in which the peripheral edge portion of the upper surface 20a is raised from the periphery, and thus a concave portion is provided in the upper surface 20 a. The concave portion is a portion for receiving the upper 10 and the insole 3, and the bottom surface of the concave portion, i.e., the upper surface 20a excluding the peripheral edge portion, has a smoothly curved shape so as to conform to the shape of the ball of the foot. However, the sole 20 may have a flat shape without the recessed portion.
The sole 20 (outsole) is preferably excellent in wear resistance and grip. Although not shown, in order to improve grip, a tread pattern may be provided by forming irregularities on the exposed surface of the ground contact surface 20b of the shoe sole 20.
The footwear component is preferably used as an outsole of a shoe. That is, the shoe of the present embodiment preferably includes a shoe member as an outsole. In this case, the performance of the outsole requiring both static friction performance and dynamic friction performance can be improved.
The outsole herein refers to a sole (sole) constituting a portion that comes into contact with a wall surface such as a rock climbing wall or a rock wall, or a ground contact surface such as a ground surface, a paved road, or a floor surface, and for example, in a sole having a single-layer structure as shown in fig. 7 and 8, the entire sole may include the above-described shoe member as the outsole. For example, in the case of a shoe sole having a two-layer structure including a midsole (highly cushioning sole) and an outsole, only the outsole may include the above-described footwear member.
The outline of the embodiment of the present invention is as follows.
(1) A footwear component comprising a material comprising a thermoplastic elastomer, and wherein,
with regard to the material in question,
a glass transition temperature (Tg) of 10 ℃ or lower,
tan delta being a hysteresis term of the frictional force is 0.4 or more, and
when the strain is changed from 5% to 100%, the change in tan δ, namely, Δ tan δ, is 0.15 or more.
By using a material selected so that Tg, tan δ and Δ tan δ fall within a predetermined range, a lightweight footwear member using a thermoplastic elastomer and having a high static and dynamic friction coefficient can be provided.
(2) The footwear member according to (1), wherein the material does not contain a filler, or the content of the filler is 10 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer.
In this case, the specific gravity of the material can be set to 1.0 or less, and the transparency of the material can be easily maintained.
(3) The footwear component according to (1) or (2), wherein the thermoplastic elastomer is a styrene-based thermoplastic elastomer or a thermoplastic polyurethane.
In this case, it is expected that a material satisfying the Tg, tan δ, and Δ tan δ can be easily obtained.
(4) The footwear member according to any one of (1) to (3), wherein the material contains a viscous liquid.
In this case, Δ tan δ of the material can be increased.
(5) The footwear member according to any one of (1) to (4), wherein the static friction coefficient is 1.8 or more and the dynamic friction coefficient is 1.6 or more.
The shoe member has excellent static friction performance and dynamic friction performance, and the static friction coefficient is more than 1.8.
(6) The footwear member according to any one of (1) to (5), which is transparent or translucent.
This makes it possible to use the light source embedded in the sole of a shoe for emitting light, or to improve the design (design) of the shoe.
(7) The footwear member according to any one of (1) to (6), which is used as an outsole of a shoe.
In this case, the performance of the outsole requiring both static friction performance and dynamic friction performance can be improved.
(8) A shoe comprising the footwear member according to any one of (1) to (7) as an outsole.
It is possible to provide a shoe in which the performance of the outsole requiring both static friction performance and dynamic friction performance is improved.
Examples
The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
(example 1)
As shown in table 1, a thermoplastic elastomer including a mixed resin of 83 mass% of SEPS ("hei ebullar (hybrid) 7125", manufactured by korea (Kuraray)) and 17 mass% of SEEPS ("Septon (Septon) 4033", manufactured by korea (Kuraray)) was prepared.
The material of example 1 (shoe member) was produced using the above raw materials.
(example 2)
The material (shoe member) of example 2 was produced in the same manner as in example 1, except that the raw material (including liquid Styrene Butadiene Rubber (SBR)) having the composition of example 2 shown in table 1 was used.
(example 3)
The material (shoe member) of example 3 was produced in the same manner as in example 2, except that the raw material (further containing a crosslinking agent) having the composition of example 3 shown in table 1 was used.
Comparative examples 1 to 4
The materials of comparative examples 1 to 4 were produced in the same manner as in example 1, except that the raw materials having the compositions of comparative examples 1 to 4 shown in table 1 were used.
[ evaluation ]
The following evaluations were performed on samples of the materials obtained in the examples and comparative examples.
< Tg, tan. delta: dynamic viscoelasticity test
The dynamic viscoelasticity (glass transition temperature: Tg, loss tangent: tan. delta.) of each sample was measured under the following measurement conditions in accordance with Japanese Industrial Standards (JIS) K63942007 using a dynamic viscoelasticity measuring apparatus "Rheogel (Rheogel) E4000" (manufactured by UBM Co., Ltd.).
(measurement conditions)
Thickness of the sample: 2mm
Width of the sample: 5mm
Distance between chucks (between holders): 20mm
Mode (2): sine wave strain, tension
Dependent variable: 0.025%
Measuring temperature: -100 ℃ to 100 DEG C
And (3) heating: 3 ℃ per minute
Specifically, referring to fig. 9, the dynamic viscoelasticity of the sample material is measured by clamping both ends of a sample having a long bar shape with an upper holder and a lower holder and vibrating the lower holder in the longitudinal direction.
The glass transition temperature Tg (. degree.C.) is the maximum value of the peak of tan. delta. in the temperature sweep analysis at a frequency of 10Hz and a strain of 0.025% (see FIG. 2). Here, tan. delta. is the value of tan. delta. at 25 ℃. Therefore, the Tg in the present invention is different from the general glass transition temperature (Tg) described in the catalog of manufacturers of the respective polymers.
＜Δtanδ＞
The Δ tan δ of each sample was measured under the following measurement conditions using a dynamic viscoelasticity measuring apparatus "DMA + 300" (manufactured by Metravib) in accordance with JIS K63942007.
(measurement conditions)
Thickness of the sample: 2mm
Width of the sample: 10mm
Between the chucks: 2mm
Mode (2): sine wave strain and shear
Measuring temperature: 25 deg.C
Frequency: 2Hz
Loading: automatic static load
Strain: 0.05% -100%, logarithmic number 31 plotting
Further, in the present invention, Δ tan δ is tan δ (tan δ) at strain from 100% 100 ) Tan delta (tan delta) minus 0.05% strain 0.05 ) The obtained value (see fig. 3) is calculated by the following formula.
Δtanδ＝tanδ 100 -tanδ 0.05
< complex modulus of elasticity: e * ＞
Complex modulus of elasticity E * (MPa) was measured under conditions of sine wave strain, tensile mode, 10Hz, 0.025% strain, and 25 ℃ using the same apparatus as for the measurement of Tg and tan. delta.
Specific gravity
The specific gravity was measured using MD-300S manufactured by Alfa Mirage.
< static friction Performance, dynamic friction Performance >
The static friction performance and the dynamic friction performance of each sample were evaluated.
Specifically, the static friction coefficient (μ s) and the dynamic friction coefficient (μ d) of each sample were measured under the following measurement conditions using a direct-acting friction tester "μ V-1000" (manufactured by Trinity Lab).
(measurement conditions)
Shape of test piece: 20mm (width) X40 mm (depth) X2 mm (height)
Retention average radius of curvature (R): 14mm
Surface roughness (Rz) of the sample: 366 μm
Inputting a load: 1000gf
Sliding speed: 10mm/sec
Sliding distance: 10mm
And (3) lubrication state: drying (Dry)
The number of times of measurement: n3
More specifically, first, the surface of the sample (sheet of each material) is uniformly polished with a polishing paper (# 400). Next, as shown in fig. 6, 10 seconds after the load was applied to the sample, the sample started to slide in the sliding direction with respect to the rock climbing plate (rough surface), and the friction coefficient was measured (see fig. 5).
Referring to fig. 5, the maximum value of the peak of the friction coefficient appearing first from the start of the test of the friction coefficient was obtained as the static friction coefficient from the measurement result of the friction coefficient. The average value of the friction coefficient in the range where the sample moved in the sliding direction (displacement amount) was 4mm to 10mm was determined as the dynamic friction coefficient.
In addition, about 10 preliminary tests were performed to obtain the average value of the measurement values of the last three times (N3) in which the measurement values were stable, and the average value is shown in table 1.
In the "evaluation of μ s and μ d" in table 1, when μ s ≧ 1.8 and μ d ≧ 1.6, the evaluation was a, and in addition, the evaluation was B.
The above evaluation results are shown in table 1.
Further, the measurement results of Tg are also shown in fig. 2. Referring to FIG. 2, Tg (maximum value of peak of tan. delta.) was 10 ℃ or less in example 1, example 2 and comparative example 2. On the other hand, comparative example 1 is higher than 10 ℃.
As is clear from fig. 3 and 4 relating to the calculation of Δ tan δ, in examples 1 and 2, Δ tan δ is larger than that in comparative example 2 (Tg of 10 ℃ or lower).
[ Table 1]
Figure BDA0003702083880000121
From the results shown in Table 1, it is understood that the shoe members of examples 1 to 3 having Tg of 10 ℃ or lower, tan. delta. of 0.4 or more, and Δ tan. delta. of 0.15 or more are excellent in both static friction performance and dynamic friction performance (μ s ≧ 1.8 and μ d ≧ 1.6).
On the other hand, it is found that the shoe members of comparative examples 1 to 4 having any one of Tg, tan δ and Δ tan δ outside the above range are not excellent in both static friction performance and dynamic friction performance.
In comparative examples 3 and 4 in which tan δ was less than 0.4, the coefficient of kinetic friction was found to be lower than that of the examples.
Further, as in examples 2 and 3, when the liquid rubber is contained, the complex modulus and Δ tan δ can be increased, and the static friction coefficient of the shoe member can be further improved.
The embodiments and examples disclosed herein are illustrative in all respects and not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications equivalent in meaning and scope to the description of the claims.
The respective characteristic structures disclosed in the above-described embodiments and examples can be combined with each other within a range not departing from the gist of the present invention.
Description of the symbols
1: shoes with removable sole
10: shoe upper
11: shoe upper body
12: tongue of shoe
13: tiptoe side reinforcement
14: heel side reinforcement
15: eyelet reinforcement
16: shoe lace
20: sole of shoe
20 a: upper surface of
20 b: ground plane

Claims (8)

1. A footwear component comprising a material comprising a thermoplastic elastomer, and wherein,
with regard to the material in question,
a glass transition temperature (Tg) of 10 ℃ or lower,
tan delta being a loss tangent in a dynamic viscoelasticity test is 0.4 or more, and
when the strain is changed from 5% to 100%, the amount of change in tan δ, i.e., Δ tan δ, is 0.15 or more.
2. The footwear member according to claim 1, wherein the material does not contain a filler, or the content of the filler with respect to 100 parts by mass of the thermoplastic elastomer is 10 parts by mass or less.
3. The footwear component of claim 1 or 2, wherein the thermoplastic elastomer is a styrene-based thermoplastic elastomer or a thermoplastic polyurethane.
4. An element for footwear according to any one of claims 1 to 3, wherein the material contains a viscous liquid.
5. The footwear component according to any one of claims 1 to 4, wherein a static friction coefficient is 1.8 or more, and a dynamic friction coefficient is 1.6 or more.
6. The footwear component of any of claims 1 to 5, being transparent or translucent.
7. The footwear component of any of claims 1 to 6, used as an outsole for a shoe.
8. A shoe comprising the footwear component of any one of claims 1 to 7 as an outsole.
CN201980103255.1A 2019-12-27 2019-12-27 Footwear member and footwear Pending CN114867379A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07177903A (en) * 1993-12-22 1995-07-18 Sumitomo Rubber Ind Ltd Shoes
JP2000189207A (en) * 1998-10-21 2000-07-11 Sumitomo Rubber Ind Ltd Outsole of shoes
JP2003237308A (en) * 2002-02-14 2003-08-27 Sumitomo Rubber Ind Ltd Pneumatic radial tire

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5985111B2 (en) * 2014-03-06 2016-09-06 株式会社アシックス Cushioning structure and shoes using the same
US20170318901A1 (en) * 2014-11-14 2017-11-09 Asics Corporation Outer sole and shoe
JP6541290B2 (en) * 2016-10-14 2019-07-10 株式会社アシックス shoes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07177903A (en) * 1993-12-22 1995-07-18 Sumitomo Rubber Ind Ltd Shoes
JP2000189207A (en) * 1998-10-21 2000-07-11 Sumitomo Rubber Ind Ltd Outsole of shoes
JP2003237308A (en) * 2002-02-14 2003-08-27 Sumitomo Rubber Ind Ltd Pneumatic radial tire

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EP4059372A4 (en) 2022-11-02
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US20230040111A1 (en) 2023-02-09
WO2021131034A1 (en) 2021-07-01

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